function output = addItem(item, position, image)
%adds image item to the structure

Options.upright=true;
Options.tresh=0.0004;
% Load image
item(position).image = imread(image);
% Get Key Points
item(position).ipts = OpenSurf(item(position).image,Options);
% Put the landmark descriptors in a matrix
item(position).desc = reshape([item(position).ipts.descriptor],64,[]);
output = item(position);